Hair curler



8 1938. e. BOULARD 2,127,349

HAIR CURLER Filed May 20, 19 37 f y, INVENTOR BY 2 RTTZZNEYJ PatentedAug. 16, 1938 UNITED STATES PATENT orFicE HAIR CURLER Gabriel Boulard,Paris, France Application May 20, 1937, Serial No. 143,643

9 Claims.

This invention relates to a hair curler that is of the type that is usedfor permanently waving hair. By this invention the hair is heated insuch close proximity to the bulb of a thermometer that the thermometerresponds promptly to the temperature which the hair reaches and therebymakes provision for enabling the operator to avoid overheating the haireither by observing the position of the mercury column in the stem ofthe thermometer or by having the mercury column in this stemautomatically cutoff the heat that is being applied to the hair.

The invention will be understood from the description in connection withthe accompanying drawing, in which Fig. 1 is a side View of anillustrative embodiment of the invention; Fig. 2 is a similar view takenat right angles to Fig. 1; Fig. 3 is a longitudinal section along theline 3-3 of Fig. 2; and Fig. 4 is a section along the line 4-4 of Fig.3.

In the drawing, reference character I indicates a glass tube that isadapted for having a lock of hair wound thereon which is to be curled orwaved. This tube is of smaller diameter at an intermediate portion, as.indicated at 2, where the hair is wound upon it, and gradually increasesin diameter on both sides of this smaller portion. This tube 1terminates at one end thereof in a cylindrical portion 3 that ispreferably smaller in diameter than the diameter of the largest part ofthis tube. The end of the cylindrical portion is closed as indicated at4 and the other end is closed as indicated at 5. A metal band 6, thatmay be corrugated trans versely if desired, is applied near the end 5and may be kept in place by any suitable sort of heat resisting cement.

A metal sleeve 1 surrounds the cylindrical portion 3 of the tube 1 andits inner end that contacts with the shoulder joining the cylindricalportion 3 to the main portion of the tube l is made in the form of aband 8 that may be corrugated transversely if desired. The sleeve 1 iscemented to the cylindrical portion 3 by any suitable heat resistingcementitious material and a Window or opening 9 is provided in thissleeve 1 for a purpose to be described.

A handle I0 of insulating material, which may be somewhat oval shaped intransverse section, is provided with a stem II which extends into thesleeve 1 and may contact with the end 4 of the portion 3. This handle l0may also be cemented in the sleeve 1 by suitable cementing material. Apin 12 is also passed through the sleeve 1 and stem II to keep the partsassembled.

The bulb l3 of the thermometer that is used in this device consists inpart of the smaller diameter portion of the glass tube 1 with the end ofthis bulb made up of a conically shaped closure member l4 that may befused or otherwise securely attached to the inside surface of thetube 1. The upper end of the bulb l3 terminates in a somewhat similarmember 15 which is, however, provided with a hole at the center and isattached there to a hollow stem that is provided with a spiral portionl6 and a straight portion I1 into which the mercury rises when the bulbis heated, the upper portion of the mercury column being visible throughthe opening 9 in the sleeve 1. The mercury in the bulb is indicated by19 and upon being heated rises in the capillary hole I8 of the stem ofthe bulb, which is graduated in a suitable manner.

A cap 20 having one end dove-tail shaped fits into a correspondingrecess in the handle Ill and a screw 21 holds this cap normally inplace. Semicircular recesses 22 are provided in the contacting faces ofthe cap 23 and handle for receiving electric wire plugs 23 and 24 thatare provided with binding screws 25 and 26 for attaching wires 21 and 28thereto. These wires 21 and 23 pass through holes in the handle I3 andstem II and terminate in the capillary hole l8 in the stem I1 of thethermometer, as indicated at 29 and 30 respectively, these wires beingsealed in place where they pass through the wall of the stem. A plate 3|is provided in the portion 3 of the tube l and transverse lines 32, 33and 34 are provided on this plate in position to be visible through thewindow 9. This plate is installed behind the stem [1 and the lines 32,33 and 34 indicate the temperature ranges within which the temperatureshould be while the device is operating. Line 34 is preferably made redto warn the operator that the temperature is dangerously high. Theterminals 29 and 33 are located so that when the mercury rises in thestem to the danger point a circuit is closed between the wires 21 and28. The terminals 22 are adapted to receive a plug of a circuit (notshown) of a well known sort in which a source of current and an alarm isprovided, so that when the mercury rises enough in the stem II to closethe contact between the wires 21 and 28, the alarm will be sounded,

I claim:

l. A hair curler comprising a hollow portion of rigid heat resistingmaterial for having hair wound thereon, a thermometer bulb in saidhollow portion, and a sleeve for supporting said hollow portion andsurrounding a portion of the stem of said thermometer.

2. A hair curler comprising a hollow portion of rigid heat resistingmaterial for having hair Wound thereon, a thermometer bulb in saidhollow portion, a sleeve for supporting said hollow portion andsurrounding a portion of the stem of said thermometer, and a handle ofinsulating material for said sleeve.

3. A hair curler comprising a hollow portion for having hair woundthereon, a thermometer bulb in said hollow portion, a sleeve forsupporting said hollow portion and surrounding a portion of the stem ofsaid thermometer, a handle of insulating material for said sleeve,electric terminals in said handle and electric wires from said terminalsextending into the inside of said stem.

4. A hair curler comprising a hollow portion for having hair woundthereon, a thermometer bulb in said hollow portion, a sleeve forsupporting said hollow portion and surrounding a portion of the stem ofsaid thermometer, a handle of insulating material for said sleeve,electric terminals in said handle and electric wires from said terminalsextending into the inside of said stem at difl'erent pointslongitudinally thereof.

5. A hair curler comprising a glass tube and a thermometer having aportion of the Wall of said tube constituting the wall of the bulb ofsaid thermometer.

6. A hair curler comprising a glass tube and a thermometer having aportion of the wall of said tube constituting the wall of the bulb ofsaid thermometer, the stem of said thermometer being spiral for aportion of its length.

7. A hair curler comprising a glass tube and a thermometer having aportion of the wall of said tube constituting the wall of the bulb ofsaid thermometer, the stem of said thermometer being spiral for aportion of its length, and electric Wires terminating inside of saidstem.

8. A hair curler comprising a glass tube and a thermometer having aportion of the wall of said tube constituting the wall of the bulb ofsaid thermometer, and a metal sleeve surrounding another portion of saidglass tube.

9. A hair curler comprising a glass tube and a thermometer having aportion of the wall of said tube constituting the wall of the bulb ofsaid thermometer, the stem of said thermometer being spiral for aportion of its length, and a metal sleeve around said stem provided withan opening through which a portion of said stem is visible.

GABRIEL BOULARD.

